安装webmin/virtualmin的时候提示Please enter a fully qualified hostname和 Please enter the name of your primary network interface错误，怎么办？

Loading log4sh logging library...
INFO - Started installation log in /root/virtualmin-install.log
INFO - Checking for fully qualified hostname...
INFO - Hostname 654z is not fully qualified.
Please enter a fully qualified hostname (for example, example.com):

报这个错误的时候，需要输入你的主机名，一般可以输入你的域名，例如 www.654z.com

 
INFO - Hostname OK: fully qualified as www.654z.com
eth0: error fetching interface information: Device not found
INFO - Unable to determine IP address of primary interface.
Please enter the name of your primary network interface:

报这个错误的时候，需要输入你的真正有效的网卡名称，例如  venet0:0

INFO - Primary address detected as 38.108.125.11
38.108.125.11  www.654z.com
INFO - Entry for IP 38.108.125.11 exists in /etc/hosts.
INFO - Updating with new hostname.
INFO - Installing serial number and license key into /etc/virtualmin-license